Those towering peaks casting shadows over San Francisco? Those are where you see the highest incidence of prostitution. Creator Doug McCune has 3D topographical maps of seven more types of San Francisco crime, from assault to vandalism. The complete set:

McCune based his maps on San Francisco's 1999 crime data, publicly available from the city. The moral of the story seems to be to avoid the Tenderloin neighborhood at all costs, and that 3D topographical maps are an incredibly entertaining way to present information. [Doug McCune via BoingBoing]